A semiconductor package includes a first optical transceiver, a second optical transceiver, a third optical transceiver, and a plasmonic waveguide. The first optical transceiver includes at least one optical input/output portion for transmitting and receiving optical signal. The second optical transceiver is stacked on the first optical transceiver. The third optical transceiver includes at least one optical input/output portion for transmitting and receiving optical signal. The third optical transceiver is stacked on the second optical transceiver. The plasmonic waveguide penetrates through the second optical transceiver and optically couples the at least one optical input/output portion of the first optical transceiver and the at least one optical input/output portion of the third optical transceiver.